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I have known him for a long time vs I know him since a long time

'I have known him for a long time' is a correct phrase, but 'I know him since a long time' is not. The correct phrase indicates a duration of acquaintance, while the incorrect one has a mistake in the preposition used with 'time.'
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Explained by Gregg
Editor at TextRanch

Last updated: July 02, 2024

I have known him for a long time

This phrase is correct and commonly used in English to indicate a long duration of acquaintance.

This phrase is used to express that you have been acquainted with someone for an extended period of time.

Examples:

  • I have known him for a long time, and we have a great friendship.
  • She has known the answer for a long time, but she didn't want to reveal it.
  • They have known each other for a long time, so they understand each other well.

Alternatives:

  • I have been acquainted with him for a long time.
  • I have been friends with him for a long time.
  • I have known him a long time.
  • I have known him for ages.
  • I have known him for a while.

I know him since a long time

This phrase is incorrect in English due to the incorrect preposition 'since' used with 'a long time.'

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